有高粘性和保留的奥氏体的适当体积百分比的 Nb-Ti 热转动的帮助旅行的钢在实验基于好铁酸盐谷物被开发了。测试，结果证明铌趋于与更少的 降水，和铌钛在矩阵处于答案状态存在能被猛抛处于良好的竟技状态( Nb ， Ti ) C 或( Nb ， Ti )...有高粘性和保留的奥氏体的适当体积百分比的 Nb-Ti 热转动的帮助旅行的钢在实验基于好铁酸盐谷物被开发了。测试，结果证明铌趋于与更少的 降水，和铌钛在矩阵处于答案状态存在能被猛抛处于良好的竟技状态( Nb ， Ti ) C 或( Nb ， Ti )( C ， N )，它在增加收益力量起一个重要作用(从 495 MPa 到 610 MPa )。而且，保留的奥氏体在在张力的变丑期间由转变改进粘性进马氏体上有积极效果。展开更多
Enhancing damping characteristic is one of the effective methods to solve the instability problem of the rotor system.The three-dimensional numerical analysis model of scallop damper seal was established,and the effec...Enhancing damping characteristic is one of the effective methods to solve the instability problem of the rotor system.The three-dimensional numerical analysis model of scallop damper seal was established,and the effects of inlet pressures,preswirl ratios,rotational speeds,interlaced angles and seal cavity depths on the rotordynamic characteristics of scallop damper seal were studied based on dynamic mesh method and multi-frequencies elliptic whirling model.Results show that the direct stiffness of the scallop damper seal increases with decreasing inlet pressure and increasing rotational speed and cavity depth.When the seal cavity is interlaced by a certain angle,which shows positive direct stiffness.The effective damping of the scallop damper seal increases with the increasing inlet pressure,the decreasing preswirl ratio and the rotational speed and cavity depth.There exists an optimal interlaced angle to maximize the effective damping and the system stability.The leakage of the scallop damper seal is significantly reduced with decreasing inlet pressure.The preswirl will reduce the leakage flowrate,and the rotational speed has a slight effect on the leakage performance.The leakage of the scallop damper seal decreases with increasing seal cavity depth.展开更多
文摘有高粘性和保留的奥氏体的适当体积百分比的 Nb-Ti 热转动的帮助旅行的钢在实验基于好铁酸盐谷物被开发了。测试，结果证明铌趋于与更少的 降水，和铌钛在矩阵处于答案状态存在能被猛抛处于良好的竟技状态( Nb ， Ti ) C 或( Nb ， Ti )( C ， N )，它在增加收益力量起一个重要作用(从 495 MPa 到 610 MPa )。而且，保留的奥氏体在在张力的变丑期间由转变改进粘性进马氏体上有积极效果。
基金co-supported by the National Natural Science Foundation of China(No.51875361)the Natural Science Foundation of Shanghai,China(No.20ZR1439200)。
文摘Enhancing damping characteristic is one of the effective methods to solve the instability problem of the rotor system.The three-dimensional numerical analysis model of scallop damper seal was established,and the effects of inlet pressures,preswirl ratios,rotational speeds,interlaced angles and seal cavity depths on the rotordynamic characteristics of scallop damper seal were studied based on dynamic mesh method and multi-frequencies elliptic whirling model.Results show that the direct stiffness of the scallop damper seal increases with decreasing inlet pressure and increasing rotational speed and cavity depth.When the seal cavity is interlaced by a certain angle,which shows positive direct stiffness.The effective damping of the scallop damper seal increases with the increasing inlet pressure,the decreasing preswirl ratio and the rotational speed and cavity depth.There exists an optimal interlaced angle to maximize the effective damping and the system stability.The leakage of the scallop damper seal is significantly reduced with decreasing inlet pressure.The preswirl will reduce the leakage flowrate,and the rotational speed has a slight effect on the leakage performance.The leakage of the scallop damper seal decreases with increasing seal cavity depth.
